DOI: 10.1002/2014GL061453
论文题名: Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features
作者: Dubinin E. ; Fraenz M. ; Zhang T.L. ; Woch J. ; Wei Y.
刊名: Geophysical Research Letters
ISSN: 0094-9791
EISSN: 1944-9522
出版年: 2014
卷: 41, 期: 18 起始页码: 6329
结束页码: 6334
语种: 英语
英文关键词: ionosphere
; magnetization
; Mars
Scopus关键词: Interplanetary flight
; Ionosphere
; Magnetic fields
; Magnetic flux
; Magnetism
; Magnetization
; Solar energy
; Topology
; Crustal magnetization
; Interplanetary magnetic fields
; Magnetic field strengths
; Magnetic field topology
; Magnetic field vectors
; Magnetic flux tube
; Mars
; Mars global surveyor
; Ionospheric measurement
; crustal structure
; electron
; ionosphere
; magnetic field
; magnetization
; Mars
; zenith angle
英文摘要: The magnetic field observations by the Mars Global Surveyor (MGS) performed on the premapping orbits in the years 1997 and 1998 in the low-altitude ionosphere of Mars show the existence of a strong "external" magnetization not related to the "internal" crustal magnetization. A significant increase of the magnetic field strength is observed in the collisional northern ionosphere at altitudes of ∼ 200 km and at 60°-90°solar zenith angles sampled by MGS. The magnetization features and the magnetic field topology vary significantly with the sector structure of the interplanetary magnetic field (IMF). For ByIMF >0 the magnetic flux tubes transported to altitudes of ∼200 km are suddenly straightened releasing their tangential stresses. For ByIMF <0 a rotation of the magnetic field vector by almost 180°occurs. Such an asymmetry in the ionospheric response on Mars is similar to the asymmetry observed on Venus at the periods of low-solar activity indicating its universal origin for magnetized ionospheres. It is suggested that the electric currents generated in the collisional ionosphere where the ions become demagnetized, while the electrons remain magnetized produce the observed features. Key PointsMagnetization peaks are found at altitudes of 200 km in the ionosphere of MarsMagnetization features and topology of the field depend on the IMF directionDecoupling of ion and electron motion is responsible for an asymmetry ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911071822&doi=10.1002%2f2014GL061453&partnerID=40&md5=827adb288ae1cd5c0dd8fc07bb202f38
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7055
Appears in Collections: 气候减缓与适应
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作者单位: Max-Planck-Institute for Solar System Research, Göttingen, Germany
Recommended Citation:
Dubinin E.,Fraenz M.,Zhang T.L.,et al. Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features[J]. Geophysical Research Letters,2014-01-01,41(18).